no question technique is the most important issue when using a TT. and although i hv experimented with various types, fact is... when used properly the Vernet is as "invisible" as any.
i also agree with earlier comments that having a few in different sizes, or loaded with foil or a magnet is also a good idea. the Darwin DVD about how to use a TT is excellent for technique. also, you cant beat a mirror to help with practice.
having said all that, presentation is everything, and your presentation will be enhanced by confidence. if a more "realistic" TT helps yr confidence and so optimises your presentation, perhaps a
www.magic-Frediup.com TT is for you. i have a couple and the detail is AMAZING! expensive, but VERY VERY good.